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A121160 Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition). 2
1, 1, 6, 12, 43, 106, 322, 864, 2483, 6829, 19226, 53293, 148866, 413501, 1151506, 3200184, 8901478, 24742852, 68800520, 191275736, 531888416 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,3

REFERENCES

Camden A. Parks and James B. Hendrickson, Enumeration of monocyclic and bicyclic carbon skeletons, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991).

LINKS

Table of n, a(n) for n=5..25.

CROSSREFS

Sequence in context: A120471 A219522 A034529 * A105863 A052904 A106692

Adjacent sequences:  A121157 A121158 A121159 * A121161 A121162 A121163

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Aug 13 2006

EXTENSIONS

More terms from N. J. A. Sloane, Aug 27 2006

STATUS

approved

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Last modified August 8 12:17 EDT 2022. Contains 356009 sequences. (Running on oeis4.)